ftrace.h

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#ifndef _ASM_POWERPC_FTRACE
#define _ASM_POWERPC_FTRACE

#ifdef CONFIG_FUNCTION_TRACER
#define MCOUNT_ADDR     ((long)(_mcount))
#define MCOUNT_INSN_SIZE    4 /* sizeof mcount call */

#ifdef __ASSEMBLY__

/* Based off of objdump optput from glibc */

#define MCOUNT_SAVE_FRAME           \
    stwu    r1,-48(r1);         \
    stw r3, 12(r1);         \
    stw r4, 16(r1);         \
    stw r5, 20(r1);         \
    stw r6, 24(r1);         \
    mflr    r3;             \
    lwz r4, 52(r1);         \
    mfcr    r5;             \
    stw r7, 28(r1);         \
    stw r8, 32(r1);         \
    stw r9, 36(r1);         \
    stw r10,40(r1);         \
    stw r3, 44(r1);         \
    stw r5, 8(r1)

#define MCOUNT_RESTORE_FRAME            \
    lwz r6, 8(r1);          \
    lwz r0, 44(r1);         \
    lwz r3, 12(r1);         \
    mtctr   r0;             \
    lwz r4, 16(r1);         \
    mtcr    r6;             \
    lwz r5, 20(r1);         \
    lwz r6, 24(r1);         \
    lwz r0, 52(r1);         \
    lwz r7, 28(r1);         \
    lwz r8, 32(r1);         \
    mtlr    r0;             \
    lwz r9, 36(r1);         \
    lwz r10,40(r1);         \
    addi    r1, r1, 48

#else /* !__ASSEMBLY__ */
extern void _mcount(void);

#ifdef CONFIG_DYNAMIC_FTRACE
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
       /* reloction of mcount call site is the same as the address */
       return addr;
}

struct dyn_arch_ftrace {
    struct module *mod;
};
#endif /*  CONFIG_DYNAMIC_FTRACE */
#endif /* __ASSEMBLY__ */

#endif

#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64) && !defined(__ASSEMBLY__)
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
    /*
     * Compare the symbol name with the system call name. Skip the .sys or .SyS
     * prefix from the symbol name and the sys prefix from the system call name and
     * just match the rest. This is only needed on ppc64 since symbol names on
     * 32bit do not start with a period so the generic function will work.
     */
    return !strcmp(sym + 4, name + 3);
}
#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 && !__ASSEMBLY__ */

#endif /* _ASM_POWERPC_FTRACE */